Astronomers contact the strategy ‘evaded vision’, and also it exploits the truth that our eyes contain 2 forms of light-detecting cells. Around the centre of the retina are so-called cone cells, which give us colour vision and require excellent light levels.

Amethod from the centre are rod cells, which are responsible for black-and-white vision, and job-related much better than the cone cells at low light levels. Looking off to one side allows more light from faint objects to strike the rod cells, and end up being visible to us.




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Robert is a scientific research writer and also visiting professor of science at Aston College. He likes maths, West End musicals and hamsters.


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